Method for making paper



June 8 1926.

R. B. DANIELS METHOD FOR MAKING PAPER Filed Febv 24,

INVENTOR VZM ATTO NEY Patented June 8, 1926.

UNITED STATES 1,587,700 PATENT OFFICE.

RUPERT is. immune; or arms, massaenu mm un'rfion iron MAKING ramm'.

Application filed February 24, 1925. Serial No. 11,068.

This invention relates to the art of paper making and pertains more particularl to the making of paper having certain de ite portions of a thickness different from that of other definite portions thereof.

It is an object of this invention to rovide a method and apparatus which siall produce such paper expeditiously and efficiently.

Other objects and advantages of the mvention will appear hereinafter.

The accompanying drawings illustrate the invention more or --less semi-diagrammatically, Figure 1 being a plan View, Figure 2 being a side elevation, certain parts being shown in section to better illustrate the invention, Figure 3 is a detail perspective view, Figure 4 is a section through the web as formed, and Figure 5 is a detail view of the fluid pressure distributing nozzles.

For purposes of convenience of description the invention has been illustrated as applied to the ordinary Fourdrinier paper making machine in which the stock comprising fibrous material and water is fiowedin a liquid state onto a moving wire through which the water is permitted to percolate gradually, leaving the fibrous mass forming the web. In such machines the wire is caused to 'travel'continuously at a uniform rate and the flow ofstock onto the wire is ordinarily controlled by slices or bars extendin across the path of the wire, said slices eing arranged to permit a substantially uniform rate of fiow of stock thereunder to forma web of uniform thickness.

According to the present invention, it is proposed to form a web in which the fibrous mass constituting certain defined portions thereof is of a different thickness from that constituting other portions thereof, and this result is accomplished by depositing the stock or pulp to form the 'web in alayer having different" thicknesses at desired different portions thereof. In the present embodiment applied to the Fourdrinier machine it is proposed to control the flow,of stock past the usual slices in such manner as-to provide a given rate of flow at-certain points and to provide a different rate of flow at other points, the web formed by so controlling the flow of the stock having defined portions of different thicknesses.

Inasmuch as the web thus formed is still in a more or less fluid state after formation, it is proposed, in addition, to maintain it in the condition in which formed until sufficient water has been removed therefrom so that there is no tendency for the pulp to flow from one portion to another.

Referring to the drawings, liquid stock from the flow box 1 passes from the flow box over the lip 2 and over the apron 3 onto the wire 4 which passes about the breast roll 4' in the usual manner. Asthe stock flows along in the direction of the arrows 1t passes under the first slice 5 which is adjusted with respect to the wire 4 in such manner as to restrict the flow of stock somewhat before passing to the second slice 6. The second slice is arranged somewhat nearer to the wire 4 than the first slice and ordlnarily permits the flow of stock thereunder to form a web 7 of uniform thickness.

According-to the present invention there are provided at intervals along the second slice means for additionally controlling the flow of stock to form the web such that a different rate of flow is permitted thereunder at these points. In the present embodiment the rate of flow of stock at such points has been controlled to form portions of less thickness than the remainder of the web, this control being effected in the resent instance by securing to the second s ice an obstruction in the form of a U-shaped plate 8 which may be secured to the slice in any suitable manner. In the present embodiment the plate 8 is bolted to the slice and an elongated slot 9 may be provided in the plate to permit vertical adjustment of the plate and an elongated slot 10 may be provided in the slice to permit lateral ad ustment of the plate.

As will be apparent, this obstruction attached to the slice restricts the flow of stock thereunder to a greater extent than along the remainder of the slice, and the web formed beyond the slice therefore, is of less thickness at this point because a less quantity of fibrous material 'has been deposited on the wire.

As previously noted, the pulpy mass forming the web is still in a more or less fluid condition after formation'by passing under the second slice. Accordingly, it is desirable under certain conditions to maintain the web in the condition in which it is formed to prevent the pulp from the thicker portions of the web from flowing over into thinner portions to practically obliterate the thinner portions already formed. It has been found that the application of fluid pressure to the thinner portions of the web is effective for this purpose, sufficient pressure being applied to merely prevent the flow of pulp from one area to another it not being sought to accomplish flow by this means. In the present em odiment air under pressure has been used for this purpose and is applied throu h a pipe 11 connected to a box 12 throu h t e flexible hose 13, said pipe being rovi ed with a series of noazles 14 arrange along its under side to direct the air toward the web in the manner desired. The box 12 may be connected to a suitable source of pressure through the conduit 12'. The pipe "11 may be conveniently supported by the usual cross rods 14 for the deckle frames and may be attached thereto by any suitable means. The pipe 11 is placed closely adjacent the back of the second slice 6 in order that the fluid pressure may be applied to the web immediately after formation thereof and before the pulp has opportunity to flow.

Any suitable number of the plates 8 may be used depending upon the number of portions of less lthickness which it ma be desired to form in the sheet. One 0 the pipes 11 for the a plication of fluid pressure is provided, 0 course, for each portion of less thickness.

It will be observed that since the method of depositin different quantities of fibrous material .as t e web is formed is followed according to the present invention, there is no material disturbance of the fibers along the border lines between portions of different thickness, such as mi ht be the case were the fibers displaced a ter formation of the web. For instance in the case illustrated herein a track or groove of less thickness is formed in the web, but the portions of the web immediately adjacent this groove are of,

substantially the same thickness as the remainder of the web. Of course, if the fluid pressure described is not a plied, a tendency for the pulp along the e ges of the groove to flow into the groove would be observed. But where the fluid pressure is applied and is properly adjusted this tendency to flow is checked and the pulp is maintained in substantially the condition in which formed until suflicient water is removed so that there is no furthertendency to flow..

It is to be understood that the invention may be variously modified and embodied within the scope of the subjoined claims.

I claim as my invention;

1. The method of applying air pressure to a continuously moving body of 111 material to maintain defined areas 0 di erent thicknesses, which comprises applying to the different thickness, and maintaining said web in the condition in which formed until set by the removal of water therefrom by the ap lication of fluid pressure to the portion of less thickness.

3. The method of making aper of substantially uniform thickness having designated portions of a different thickness, which comprises controlling the flow of stock to form the web to permit a given rate of flow for one portion thereof and a different rate ofvflow for" another portion thereof, and maintaining said web in the condition in which formed until set by the removal of water therefrom by the application of fluid ressure to the relatively thinner portion t ereof.

4. The method of making paper of substantially uniform thickness having desig nated portions of a different thickness,

which comprises controlling the flow of stock to form the web to permit two or more different given uniform rates of flow simultaneously to form different portions of said web, and maintaining said web in the condition in which formed until set by the removal of water therefrom by the "application of fluid pressure to the relatively thinner portion thereof.

5. The method of making paper of substantially uniform thickness having designated portions of less thickness, which comprises controlling the flow of stock to form the web to permit a given rate of flow, restricting the flow of stock at certain points to permit a less rate of flow, and maintaining said web in-the condition in which formed until set by the removal of water therefrom by the application of fluid pressure to the portion of less thickness;

6. The method of making paper of substantially uniform thickness having a groove of less thickness formed therein which consists in permitting the stock to flow evenly to form a layer of fibrous material while restricting the flow at the point at which saidgroove is to be formed, and

applying ,air pressure to said roove sufficient to prevent inflow of material from ad-' jacent portions of the web.

In testimony whereof, I have signed my name to this specification this 19th day of February, 1925.

RUPERT B. DANIELS. 

